Audi A4 B8 A6 C7 VW Passat B7 Sharan 5N Fuel Tank Filler Cap Diesel 3C0201553K

Audi A4 B8 A6 C7 VW Passat B7 Sharan 5N Fuel Tank Filler Cap Diesel is a precision-engineered component from the Fuel filler flaps and caps category, designed for diesel engine fuel systems. It ensures a tight seal of the filler neck, stabilizes the operating conditions of the fuel system, and reduces the risk of contaminants entering the tank.

Specifications and technical data

• SKU: 3C0201553K
• Mark: Audi
• Condition: Used
• OEM Part Number: 3C0201553K
• Substitutable numbers: 3C0201553K, 3C0 201 553 K
• Fuel type: Diesel
• Category: Fuel Tank Caps

Purpose and technical function

The presented cap is dedicated to vehicles powered by Diesel fuel, which is crucial for proper venting and system tightness. As a component that closes the filler neck, it is responsible for:

• maintaining the correct pressure in the fuel tank,
• protecting against the ingress of water, dust, and other contaminants,
• reducing diesel evaporation,
• stable mounting in the filler socket.

Thanks to its fitment for specific Audi and VW models, the cap works with the factory filler neck, which promotes trouble-free use in daily operation.

Construction and vehicle fitment

Audi A4 B8 A6 C7 VW Passat B7 Sharan 5N Fuel Tank Filler Cap Diesel has been designed as a component compliant with the vehicle manufacturer's requirements. This means maintaining the correct geometry, working diameter, and sealing characteristics, which translates into:

• a secure "click" when closing,
• proper positioning of the seal relative to the filler neck,
• stable retention in the socket during refueling and driving.

Such a fit reduces the risk of fuel leaks and tank venting problems that can occur with randomly selected replacements.

Condition, origin, and benefits of choosing

The offered cap comes from the Audi brand and is an aftermarket component in Used condition. In practice, this means that it:

• retains its factory design and operating parameters,
• has already been "proven" in real operating conditions,
• represents a reasonable cost-effective choice while maintaining compatibility with the fuel system.

For many users, this is a compromise between quality and price, especially during maintenance repairs where maintaining proper tightness and functionality of the filler is key.

Fuel system safety and operation

A correctly selected filler cap has a direct impact on the safety of vehicle refueling and the stability of the fuel system. In the case of diesel engines, it is important to:

• maintain the cleanliness of the diesel fuel in the tank,
• prevent the ingress of air and moisture,
• protect against uncontrolled fuel leakage when the vehicle is tilted.

To better understand the role of the cap in the context of the entire fuel system, it is worth checking out the guide on diagnostics and operation of the fuel system – it is discussed in detail in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

Selection within the category and further expansion

If you are planning a comprehensive repair or upgrade of the fuel filler area in your Audi and need other elements from the same group, such as additional caps, flaps, or mounting elements, check the available parts in the Audi fuel filler flaps and caps category.